ASA S12.53 1999 Part2
$37.92
ANSI/ASA S12.53-1999/Part 2 / ISO 3743-2:1994 (R2015) American National Standard Acoustics – Determination of sound power levels of noise sources using sound pressure – Engineering methods for small, movable sources in reverberant fields – Part 2: Methods for special reverberation test rooms (a nationally adopted international standard). This standard, along with ANSI S12.53/Part 1-2011 replaces ANSI S12.33-1990
| Published By | Publication Date | Number of Pages |
| ASA | 1999 | 38 |
None
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 12 | Tables 0.1 International Standards specifying various methods for determining the sound power levels of machines and equipment |
| 13 | 1 Scope |
| 15 | 2 Normative references 3 Definitions 1 Estimated values of the standard deviation of reproducibility of sound power levels determined according to this part of ISO 3743 |
| 16 | Figures 1 Values of R at the one-third-octave-band centre frequencies for V=70 m3 |
| 17 | 2 Maximum permitted differences between octave-band power levels of broad-band noise sources measured in accordance with 4.7 a |
| 18 | 3 Relative tolerances for the instrumentation system |
| 20 | 4 Minimum number of source locations, N5 , for given numbers of microphone positions, Nm , values of estimated standard deviations, Sm , and octave-band centre frequencies |
| 24 | 5 Corrections for background sound pressure levels . . . . . . . . . . . . . . . . 1 O A.1 Calibration accuracy for reference sound source |
| 25 | 4 5 6 7 8 9 10 Requirements for special reverberation test room ………….. . Instrumentation …………………………………….. . Installation and operation of source under test …………….. . Measurements in test room ……………………………. . Calculation of sound power levels ………………………. . Information to be recorded ……………………………. . Information to be reported Annexes A Characteristics and calibration of reference sound source 3 5 6 7 10 11 11 12 8 Guidelines for the design of special reverberation test rooms 8.1 Recommended room dimension ratios for rectangular rooms |
| 26 | 8.1 Hardboard membrane absorber 8.2 Sound absorption coefficient a for the membrane absorber measured in a 200 m3 reverberation room |
| 28 | 8.3 Limiting curves for the ratio of the reverberation time T to the nominal reverberation time Tnom for a 70 m3 room |
| 29 | 8.4 Plot of an experimentally determined reverberation time (normalized to T1000) as a function of one-third-octave-band centre frequency |
| 30 | C Examples of suitable instrumentation systems |
| 32 | D Bibliography |
